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DAC8564 Scheda tecnica(PDF) 33 Page - Texas Instruments

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Il numero della parte DAC8564
Spiegazioni elettronici  12-Bit, Quad Channel, Ultra-Low Glitch, Voltage Output DIGITAL-TO-ANALOG CONVERTER with 2.5V, 2ppm/째C Internal Reference
PDF  46 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

DAC8564 Scheda tecnica(HTML) 33 Page - Texas Instruments

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DAC7565
www.ti.com ............................................................................................................................................... SBAS412A – FEBRUARY 2008 – REVISED MARCH 2008
Example 5: Power-Down All Channels Simultaneously while Reference is Always Powered Up
• 1st: Write sequence for enabling the DAC7565 internal reference all the time:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11-DB4
DB3-DB0
(LD1)
(LD0)
(DAC Sel 1)
(DAC Sel 0)
(PD0)
0
0
0
0
0
0
0
1
0
0
0
1
X
X
• 2nd: Write sequence to power-down all DACs to high-impedance:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11-DB4
DB3-DB0
(LD1)
(LD0)
(DAC Sel 1)
(DAC Sel 0)
(PD0)
0
0
1
1
0
1
0
1
1
1
X
X
X
X
The DAC A, DAC B, DAC C, and DAC D analog outputs sequentially power-down to high-impedance upon
completion of the first and second write sequences, respectively.
Example 6: Write a Specific Value to All DACs while Reference is Always Powered Down
• 1st: Write sequence for disabling the DAC7565 internal reference all the time (after this sequence, the
DAC7565 requires an external reference source to function):
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11-DB4
DB3-DB0
(LD1)
(LD0)
(DAC Sel 1)
(DAC Sel 0)
(PD0)
0
0
0
0
0
0
0
1
0
0
1
0
X
X
• 2nd: Write sequence to write specified data to all DACs:
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11-DB4
DB3-DB0
(LD1)
(LD0)
(DAC Sel 1)
(DAC Sel 0)
(PD0)
0
0
1
1
0
1
0
0
D11
D10
D9
D8
D7–D0
X
The DAC A, DAC B, DAC C, and DAC D analog outputs simultaneously settle to the specified values upon
completion of the fourth write sequence. (The DAC voltages update simultaneously after the 24th SCLK falling
edge of the fourth write cycle). Reference is always powered-down.
Example 7: Write a Specific Value to DAC A, while Reference is Placed in Default Mode and All Other
DACs are Powered Down to High-Impedance
• 1st: Write sequence for placing the DAC7565 internal reference into default mode. Alternately, this step can
be replaced by performing a power-on reset (see the Power-On Reset section):
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11-DB4
DB3-DB0
(LD1)
(LD0)
(DAC Sel 1)
(DAC Sel 0)
(PD0)
0
0
0
0
0
0
0
1
0
0
0
0
X
X
• 2nd: Write sequence to power-down all DACs to high-impedance (after this sequence, the DAC7565 internal
reference powers down automatically):
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11-DB4
DB3-DB0
(LD1)
(LD0)
(DAC Sel 1)
(DAC Sel 0)
(PD0)
0
0
1
1
0
1
0
1
1
1
X
X
X
X
• 3rd: Write sequence to power-up DAC A to a specified value (after this sequence, the DAC7565 internal
reference powers up automatically):
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11-DB4
DB3-DB0
(LD1)
(LD0)
(DAC Sel 1)
(DAC Sel 0)
(PD0)
0
0
0
1
0
0
0
0
D11
D10
D9
D8
D7–D0
X
The DAC B, DAC C, and DAC D analog outputs simultaneously power-down to high-impedance, and DAC A
settles to the specified value upon completion.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): DAC7565



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